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Temperature-Inert Coinage Metal Cluster Scintillator.

You-Song Hu1, Yan-Hao Liu1, Ruo-Yu Cao1

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Summary

A novel copper sulfide (Cu4S) cluster scintillator demonstrates temperature-independent radioluminescence, overcoming a key limitation in radiation detection. This breakthrough enables stable, high-resolution X-ray imaging across a wide temperature range.

Keywords:
Coinage metal clusterRadioluminescenceTemperature‐inertX‐ray scintillator

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Area of Science:

  • Materials Science
  • Radiological Imaging
  • Luminescence

Background:

  • Scintillators convert ionizing radiation to photons but are typically temperature-sensitive, limiting their applications.
  • Radioluminescence intensity often decreases significantly with increasing temperature.

Purpose of the Study:

  • To develop a temperature-inert scintillator material.
  • To investigate the luminescence mechanism of the new material.
  • To demonstrate its application in high-resolution X-ray imaging.

Main Methods:

  • Preparation of a coinage metal cluster scintillator (Cu4S).
  • Characterization of radioluminescence intensity across a wide temperature range (80–450 K).
  • Mechanism study involving thermally activated delayed fluorescence (TADF) and C–H···π interactions.
  • Fabrication of a flexible scintillator screen using Cu4S and polydimethylsiloxane (PDMS).
  • Performance evaluation of the scintillator screen in X-ray imaging.

Main Results:

  • Cu4S exhibited intense radioluminescence with minimal fluctuations from 80 to 450 K.
  • Mechanism revealed restricted geometric relaxation and small reorganization energy, leading to temperature-independent luminescence.
  • Cu4S demonstrated excellent water, oxygen, and thermal stability.
  • A flexible Cu4S-PDMS scintillator screen achieved high-resolution X-ray imaging (above 20 LP mm⁻¹) with stable performance across temperatures.

Conclusions:

  • Cu4S is a promising temperature-inert scintillator material with TADF properties.
  • The material's stability and unique luminescence behavior enable robust, high-resolution X-ray imaging applications.
  • This work overcomes temperature-dependent limitations in scintillator technology.